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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '13e852b3f24d906ca79308290b98f1d21fb1e04eaeb02baf54257bf76411d12e' 
  AND token = 'AS4spH1FapSFeDnzowGTrEIGBaLG8BZPUUkcaFNJXks=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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