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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'fbd82ca62e877230d9e6370df888465472c6c1ea3ae18bb3010ca20e5948a25f' 
  AND token = '7a0Ilx4+87AFnV8qy+aNZ8Qg7BspKJfOvFYLPiL1n4I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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