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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2a609e84c696cffbabe5e35bec94d73631abd4d3029c9dbc22f6be2ac0416e64' 
  AND token = '7RkeJjVpwrWeyht6YQoTaK39HQexILhQbgWp5JqCq2s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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