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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f80c5ef8a37ccd867721c926fea16e1b3c0c5bf671cf0e96c0e5ce34fea6f7c1' 
  AND token = 'OixQG1b8m0qbJ8+rJOKqhO0pck8HgCNv/rnmgCDr6UM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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