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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3eab7d614aabf6d1bb379bced4c21c4e845a11b4e1545395dba505f4aeaa5e2b' 
  AND token = 'Zr9nWCyiMWIb0iyatSe4jrByrSgX6UBZnjoPb9fBVLM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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