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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'bb96274495d7111207e6bc7e809699855600036d09fbbf9d5a0d16dc1c50b88f' 
  AND token = 'PEuc8GzuEagc0a4BgS70EjMO8+qzQf1UKp/p/qRNEK8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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