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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '314fc53172968160fda214bc53d7cd07f4324f1836e82f1fa754f79c8f5d7195' 
  AND token = 'DTmPF8PfIdYTH7ZQKZ1IDMJAAaDiH8g3Bu3erMSHV2I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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