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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c24babb73516b424425032c34840e7cb203b085b29562fe0994cd7eac5b80f5b' 
  AND token = '/0oZy9/dtdB3vVS9QYCGtheez7vRXQEPzY9pp+eXX5E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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