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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '52bc6c74c4b2e3a0328c907dad13e0ff43e4b82c4d8244fca5826a48d8d18720' 
  AND token = '/6IbwvgL7908qoTjG31X74aCiyCOh3uu54AcoAbEyGo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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