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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '20d77c8a08733e2b3f0b39ce399208e07fc654d837b21fb1441963428eb90dd1' 
  AND token = 'Cei/qDBcJ7Wa88lDHbik7dOd8OXJ+2+1bsCZdamOeJg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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