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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0166fd7b9e4c82ea867b25f16a28d59f32abee6eaf87401975f907a2f5e0b524' 
  AND token = 'nHOxVJGRhg7HhbMms5zcsTelnh9V5bn74BqU0dRqWHY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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