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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'de4766a10d4a396c64ad33328741f7f7c7a6082d08d16c35154986aec2b1afd0' 
  AND token = 'ik8MDFH7DX4tDeiH/seIhw0wND/YFJqLO8F+hyGOHn4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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