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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7223f6d245179b5fccd358de879b255e0556a9d200dfa806ce7a54ca928a17f6' 
  AND token = '6B55DeO1JhcQsFZjnS7alnRlDL8FB+S2KD1GOHlJCUc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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