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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e0eed08f12eab81a56e9b42d0315203089194e83832b0871c3a886707ece43d3' 
  AND token = '1qScIcvxwkmRGiysJS/WNS7SCdQnGkpUpolgm+81UeA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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