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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '62bf98621f35aa117406733feb27dd9242f44f4de9a8ae77743f79a0d7fc7b09' 
  AND token = 'NJsduM8+xx8kYjf6O82NFO6Hx54blJNqA0TE3uz/oCM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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