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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3f4401c07c8103169804f523832d45e53aedcc1f783fffecb72348b31ad7d2df' 
  AND token = 'ehN7PRiivfGnb8tnLMUXpl3fvz1e/0LtpeI3OiqmG6Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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