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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'bfc040d48f074b3287d7fc9efa9c1fae86cacec45e44213e5f8084d76b1e40b5' 
  AND token = '4OUZrOSYf/7IPn2OV8izCbhxhQU5FClhb1VBiAR8EGA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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