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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd56371e073051ebe7836e4c358453ffda7349cee33f9f4a7c79830fa47a61282' 
  AND token = 'DxrbHviVHNUgyZY+wp18G+R6P3OrU8W3kYcVwweWLFE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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