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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '66c5555a8336ebacbc48df3b607ba17515c4d93060010df78703b3567b5df457' 
  AND token = 'HKngzw+eMbhrS43Og36yPUcMMO/AJpIVhD31MN7ip18=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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