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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0857e567409f8074d9400b3f488fd8e6b06072cb76aed8c729f2d214378e0b7e' 
  AND token = '8DBx/3pLF8AFlHvL8ia7tO0drTTN0eBVN0XMq2GyVlI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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