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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5d6c9b29ddbd2bf23cffcbf619c1fc76e8d6f7c68585b5b4213302125ece10f4' 
  AND token = 'WIujAUM3CShJZ/15ohdixXv9ZQDKEhbav4NG6HNayAQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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