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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9b3a73d3c6a9469674d4dd30fca66f785eaf25e5d28d6445244fbb715ab99fef' 
  AND token = 'S+yBXKVQlx2LpN47q1xMbkHVQs9VTYUAZi4t12AiLuQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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