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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2e5b09b1353dfdec80f9f09c5d223c8a99de2fee6f17eea6fbb5bebd9ff807c8' 
  AND token = 'JOkNQziLa7lJR7irDm/7dsr1Wum/hp9RvGYtG8YDCXk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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