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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6aa18b99d89d7d5eb51d7ac519f5664230307c0400b877eb34da8333bed82724' 
  AND token = '8fgsK1AHuBlE+0bfudo/pbHOl2c0rYqfLCfjEAS8BPE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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