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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '68b70c196284023ce11b5f4afa1bcbc73a36b7bbd17f966de5a14578cdd8027d' 
  AND token = 'RL9PctjeX3ok1hoibsqj0ZkPXNGALxQ0RhRMUE2u4BU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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