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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4a5997dce7a782bf4fb189af235feed82f47a1500ca28805acb3d3539847e7fa' 
  AND token = 'guVOADL3jhPoVHKSfGP3pXeOmUVmOwnbieLbp4xRrr0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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