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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd8404ca710d0d18585eaf20e63ce92f4c56c5ca55bea7eab69274a182adb5c53' 
  AND token = '0g2YzKc2xaoGIq6zBe4lbkWetpfCyhk076R4TQ0faQ8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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