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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1e5a31a5c04a8b54e568b57deca0118d2a2f0a5d338ac46fe7f8eac1817cca60' 
  AND token = 'SFtYPOAUZ3Qqb0bHl4CmsvuyMgtNLKT+HhuyEQsp+bo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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