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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '855f0443b9a3ac3ace18e7e6459665e0abdca57f061158a7ba94c6659b1b1ae1' 
  AND token = 'Pssc6Y6NTzkE5zi0WBuLQ7F818dOksABZgySfVxMzkw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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