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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '54af12519edac8f5e717cef02b751cc442ceb0efc50f3d2872b7a745e89bddbb' 
  AND token = 'Vkel+9RwnxCPFueKFYe65gxb5sK+fCV+5Z/st7WRwms=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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