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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4a82bbfe4fb1d2316bdc01bd83a6ef2f5e70b82757aa4148953773c15925d9eb' 
  AND token = 'qRyaEv//wP9iK6pZW0gmuMl6EqkEP9x72iCCR24WapU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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