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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b6640a2009065fa47fe526b2ae152e8effcfcf9966029a73850eacb429e3b468' 
  AND token = 'cuNbKbgqnnKineQIXDYXF4ZfwP4R+EVC54XwT/wP2qM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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