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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0c0a1de3b7a1e7fa6dd72fecf0ddcc8a9b7a24ae25e2adfcc5d4da5cc6c51553' 
  AND token = 'sX7vB7fha0cVpsUb1E6xAVt1aW0910p4I400rskXpgc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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