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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5b341035d3cd671ca01626b6600604a8d1411bb54696f4508e18f8e7675d92b2' 
  AND token = 'LKAGcaoOWpMHOUvqRXnuGZXavSwYM3nc4iGdnuSel/8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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