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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '02c9ff60424c1ea49fb60028952f896a0119925314f185dab7aee358189f4f71' 
  AND token = 'Ow0zzPNtlPkJN5gBP75DHUCpJWlbo44urZNU70q0e20=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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