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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'bfdc4f8c6c963ef59c2604fc73858441915b9e82e9b8eac583ffea4c7c4b6475' 
  AND token = '/qmCI3BN16gfire+X6+aaWtskeyOuw/DpEISVT84Z64=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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