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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '59788d63485ea783a2bed88f39a72a4504f7de3e1fefdf43714e8cfdba8b3d59' 
  AND token = 'mXgeP6BIdB1pVPqIxPXUqqc3yGeBBO99I8TFNnjp+OU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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