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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '93710b3825055a20721eee6cf87fc06eb5c63c9439c34f924efbfd32ba7836db' 
  AND token = 'UDbDchAD586UrLNFj0gHi6+0+RYVCYSNMquRhbH1yks=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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