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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a2b2635530f1d8ec96a7d84ce4fb2408542ddff7d16e4e48a32048a8efd2bddf' 
  AND token = 'SKMY2g4EGEzZDuYoRdr4mh+W3FBoUBharrkF5MyCJbQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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