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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'cb3c65911dc87479a9cc1e1bc23902b19d518dbc64c9946c39e716768aabd080' 
  AND token = 'bg7Ls1dWHfa83U7ZJXsT264mOS6LxLq5avZmgcTcZRE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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