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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '223c532bb1a3375ca8d0c25dcc4d099503f396877004e606900ae931a098f38d' 
  AND token = '3o2jeGwkByiXFu3gxToceoGAOyN6ukGmlc4AAnNHA3k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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