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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e6a0e9482f7edd5fca1657a7cf14a26dece4a6fb9261f57c1485eb68074dffcf' 
  AND token = 'dTLHfe67ADntzfhXPDq/bIiqNbGFqJGpkubSRvvhAOw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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