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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e3598d34bf1c865b5f217a310d7c49c204d98415d3c1fc73049e8fdecd3da392' 
  AND token = 'S0QC+uTsY5uNb0k9erWXTbXmesjj5v2s4loQphaGZ3I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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