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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a581c65f12ac823086258977d9d3a188ba6a7c7f2b8691e2d0e7fa31f0a23690' 
  AND token = 'EBcOTGVLDtru17E6HP9yNuykVT2M+0HTU5zvrhTpgTU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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