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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '508683a589450a3ad3631c07ee301aa43bf0046aa2f7ff46e6ef04c17e7d3be9' 
  AND token = 'VytNcBWc6FOfagUiU7ScG6AxuMwFR4+a/suBpoWb0E0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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