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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '41264589ddad401643688b75e9d2c4b4cb5f303110e9055abc2ed985d36c6551' 
  AND token = 'eu/mQuX6TCIEePKW5PZF3Q4Qma1agHF9WSVwGDrqQCs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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