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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4d59bc18a11dbc80a7b6657b0f1a38c07f78575055623dd62728fa398a29e8b2' 
  AND token = '/bLtXLTPLcXw4n7Gm2sjAjyp627X7p6rl5zi8bnhFjA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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