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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '587c556020edad3752bd7a74413353158c29670554accf484523eb43a2b4d314' 
  AND token = '7GiXRCGpGz8G9fhxIImYbWriR3aB2BjxVlHogi4BGq0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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