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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8960bb6dc7c0f74bcc1b1eca3f500a47c4273cb885fe8eda945ae63082bcd572' 
  AND token = 'wFYckifiB7QQwYWpW0CvHb68+9HHruIBIVXI4b5moLs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}