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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd28a56a7c1f8083454a036d127c5c0f1e05ace8d058a1544db176f6b73620141' 
  AND token = 'asFeZs+i88z0+ND+jdJt989JPZTRoUWeGUq7bJrVYbc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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