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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '877021a77f0480e897ba3f2abaca9af514a13aba5cffe061c902aa32e7e7afaf' 
  AND token = 'aC1CTURqPWJx9c4xObrNIlxv596S6owJ2K5lEmcCLM4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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