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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3c86c5e1b6707fc3f09f97fdf4520e5a9c05b33db8d4987cbbddc79bd94ac56a' 
  AND token = 'Zieyp4QMNwAUCgqprTfn4D2rkVdICjsfzfIX4lQ48+c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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