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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'cdcc0f21f0696546c676e88362d46b4a46d92f4a0dc8dfde45447dc1711e203d' 
  AND token = 'ixvMdezwJPlJ9PymOC90dQ1orwRajt3zaoKYaWJdXJg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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