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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '409b497ae0a007c7637c631ae2a2f7511632f8a0b086ba34ac17bba727750be5' 
  AND token = 'zImdgL19pdwHEM+mxpLeIYk3fD6ycGuJ3BHeprUXlXk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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