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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0e4840caf91c305abb617040b2a01f49b77843bc60c57ee28817651d870cc6e9' 
  AND token = 'T2KO7e2ticBDJnpWLJ9Je/ICQFjFlxHhxDT74NPzU2w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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