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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '514758cbb4322296b2a5d7e411e338ca7769a3d3deb259804369e2481839490c' 
  AND token = 'C9RlhSyP+OSn51LB1it75Tc9BY4PLg+HVj2EpvDvNYQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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